 Polymeric mixture of butadiene and acrylonitrile in the respective ratio 2:1.  Ratios can be varied to change physical properties...higher levels of acrylonitrile yield low temperature flexibility, and increase compound hardness  Highly polar elastomer (large and reversible elsatic deformation)

ExcellentGoodFairPoor Tensile strength Elongation Low temperature flexibility Compression Set Tear resistance Abrasion resistance Flame resistance Gas permeability

ExcellentGoodFairPoor Water Petroleum oil Silicone lubricants Dilute acids Dilute alkalis Hydraulic fluids Transmission fluid Steam Ozone Weather Ketones Strong acids Brake fluid

 Vibration Control of horizontal forces up to 125 tons  O Rings, gaskets, sealants, grommets and tubing pads  Frequently used in automotive air conditioning systems employing R-134a refrigerants

 Nitrile should not be exposed to › direct sunlight › moderate to high levels of atmospheric ozone › oxygen  Must be used in a closed system

 Nitrile accepts antidegradants, which improve the aforementioned properties › PVC (polyvinyl chloride) › Hydrogenation

 High tensile strength  Low permanent set  Good abrasion resistance  High elasticity  Stability toward thermal ageing  Better properties at low temperatures

 Nitrile rubber is hydrogenated in solution using precious metal catalysts  Carbon-carbon bonds are converted to more stable single bonds (controls different states)  Can be crosslinked using sulphur and peroxide cure systems

Nitrile  1/32” thick $14.80 per square yard  ¼” thick $72.20 per square yard Hydrogenated Nitrile  2 to 3 times more expensive than the conventional polychloroprene used now  New features will allow it to last 5.5 times longer